Thanks for all the input. To respond to last questions:
Amps: We have access to some decent integrated amps. Pass Labs INT25,Leben 600, ARC I-50, Luxman 509. Dan D'Agostino was generous enough to loan us an Amp last time. Perhaps we can borrow his newer Integrated.I will also ask the makers if they have any preferences.
Source: Turntables are available but CD will be safer. We have access to a Hegel Mohican and a dCs transport.
Rooms: 14' x 19' x 10' were used in the 2019 event. Limited glass surfaces with some diffusion. They worked well. Seating for about 25 people who make good absorbers. We have panels to use as needed.
Format: Two equal sized listening rooms.Set up 5 speakers per room. Play each speaker for 15 minutes using 3-4 different songs covering jazz, classical, electronic, pop/rock. 70-80 db range. One day event. $10 entry fee to offset space cost.
Lot of work and a lot of fun. Hope to be held in June 2022.